VIDEO 1: (Grades K-2)http://www.learner.org/courses/learningmath/geometry/session10/part_b/analyzingk2.html
1. View the videoclip. Which levels of geometric thinking are targeted with this activity?




VIDEO 2: (Grades 3-5) http://www.learner.org/channel/courses/learningmath/geometry/session10/35video.html (Formulating rules for triangles)
1. View the videoclip of the geometry lesson and look for evidence that students are reasoning at van Hiele level 1 or van Hiele level 2.
2. In what ways does the teacher encourage students to move to the next level?